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In most nightclub environments, dark wool, cotton or synthetic slacks mate well with a button up shirt. Gentlemen in nightclubs should use caution to distinguish between button-up shirts appropriate for nightclub wear and the dressier, somewhat stodgier button-up shirts intended for professional office wear.
Some wear heels and some don't. I've seen the highest stilettos to flats at clubs. That being said, it's the girls in the stillettos that are usually stumbling down the strip barefoot, at 4 in the morning. Personally I think a nice pair of flats or dressy sandals still looks fine when you go clubbing.